REUTERSWASHINGTON (Reuters) - At a time when China is working on an ambitious lunar...WASHINGTON (Reuters) - At a time when China is working on an ambitious lunar program, President Donald Trump vowed on Monday that the United States will remain the leader in space exploration as he began a process to return Americans...2 days

REUTERSWASHINGTON (Reuters) - At a time when China is working on an ambitious lunar program, President Donald Trump...WASHINGTON (Reuters) - At a time when China is working on an ambitious lunar program, President Donald Trump vowed on Monday that the United States will remain the leader in space exploration as he began a process to return Americans...2 days